WORKAROUND: As this appears to be happening during the update check (http://nagios.sourceforge.net/docs/3_0/configmain.html#check_for_updates), I switched it off on nagios.cfg
check_for_updates=0 After this, I restarted, and it all works fine again (although I get a warning about update checks on the front page). -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to nagios3 in ubuntu. https://bugs.launchpad.net/bugs/693372 Title: Error starting nagios3 -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs